Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d1704b4748f468…

MALICIOUS

PDF

92.5 KB Created: 2021-09-12 14:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9c4e2dd22e6fb8da449248429d87f91 SHA-1: f5f7bade6367dffb391586a1052344ed2222f683 SHA-256: 80d1704b4748f468e290b1e1b18135cb7c817e36c68709fe31739225397e1375
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc25b5a883---papisusizig.pdf In PDF document text
    • http://pickup-ws.com/userfiles/files/77152811541.pdfIn PDF document text
    • http://videocycling.info/files/file/52933912841.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/55204570362.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/37126248760.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/28228042037.pdfIn PDF document text
    • http://sdes.in/uploads/gujedixawegosiwifozamed.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/tirojatege.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/xetuzobefotiloxamosuv.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/luxorab.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11085753404.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/mivag.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/rumoralapej.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/makebapabunufajanirif.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/dugamo.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/rudajoz.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/51185221658.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/99606304459.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/15d60d8c373a7f1d3fdebfc20e765c4a/65080364295.pdfIn PDF document text
    • http://espokebar.com/uploads/files/95246019942.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/5231734099.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/sebegusufigovemilironazo.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/fojeluteragutuwagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dict%C3%A9e+vocale+android+gratuitPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF3 10696 bytes
SHA-256: ede1cf9ce0d0fece2b2f29402eb1f176709be3d5335418ecf019b881990cf95c
font_01_sfnt_off0001161c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161C 20608 bytes
SHA-256: f4214c93ea8dd5392a8eceb92d5c8489dfb62563ed78bf9bcd2bc57814ace82f
font_02_sfnt_off00014a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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